From f3a96a42af5565562adadb00524ad386038aafff Mon Sep 17 00:00:00 2001
From: Daniel Matuschek <info@crazy-audio.com>
Date: Mon, 4 Aug 2014 10:06:56 +0200
Subject: [PATCH] Added support for HiFiBerry DAC+

The driver is based on the HiFiBerry DAC driver. However HiFiBerry DAC+ uses
a different codec chip (PCM5122), therefore a new driver is necessary.
---
 sound/soc/bcm/Kconfig             |   7 ++
 sound/soc/bcm/Makefile            |   2 +
 sound/soc/bcm/hifiberry_dacplus.c | 141 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 150 insertions(+)
 create mode 100644 sound/soc/bcm/hifiberry_dacplus.c

--- a/sound/soc/bcm/Kconfig
+++ b/sound/soc/bcm/Kconfig
@@ -15,6 +15,13 @@ config SND_BCM2708_SOC_HIFIBERRY_DAC
         help
          Say Y or M if you want to add support for HifiBerry DAC.
 
+config SND_BCM2708_SOC_HIFIBERRY_DACPLUS
+        tristate "Support for HifiBerry DAC+"
+        depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
+        select SND_SOC_PCM512x
+        help
+         Say Y or M if you want to add support for HifiBerry DAC+.
+
 config SND_BCM2708_SOC_HIFIBERRY_DIGI
         tristate "Support for HifiBerry Digi"
         depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
--- a/sound/soc/bcm/Makefile
+++ b/sound/soc/bcm/Makefile
@@ -5,11 +5,13 @@ obj-$(CONFIG_SND_BCM2835_SOC_I2S) += snd
 
 # BCM2708 Machine Support
 snd-soc-hifiberry-dac-objs := hifiberry_dac.o
+snd-soc-hifiberry-dacplus-objs := hifiberry_dacplus.o
 snd-soc-hifiberry-digi-objs := hifiberry_digi.o
 snd-soc-rpi-dac-objs := rpi-dac.o
 snd-soc-iqaudio-dac-objs := iqaudio-dac.o
 
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
+obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUS) += snd-soc-hifiberry-dacplus.o
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DIGI) += snd-soc-hifiberry-digi.o
 obj-$(CONFIG_SND_BCM2708_SOC_RPI_DAC) += snd-soc-rpi-dac.o
 obj-$(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC) += snd-soc-iqaudio-dac.o
--- /dev/null
+++ b/sound/soc/bcm/hifiberry_dacplus.c
@@ -0,0 +1,141 @@
+/*
+ * ASoC Driver for HiFiBerry DAC+
+ *
+ * Author:	Daniel Matuschek
+ *		Copyright 2014
+ *		based on code by Florian Meier <florian.meier@koalo.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/jack.h>
+
+#include "../codecs/pcm512x.h"
+
+static int snd_rpi_hifiberry_dacplus_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_codec *codec = rtd->codec;
+	snd_soc_update_bits(codec, PCM512x_GPIO_EN, 0x08, 0x08);
+	snd_soc_update_bits(codec, PCM512x_GPIO_OUTPUT_4, 0xf, 0x02);
+	snd_soc_update_bits(codec, PCM512x_GPIO_CONTROL_1, 0x08,0x08);
+	return 0;
+}
+
+static int snd_rpi_hifiberry_dacplus_hw_params(struct snd_pcm_substream *substream,
+				       struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+	return snd_soc_dai_set_bclk_ratio(cpu_dai, 64);
+}
+
+static int snd_rpi_hifiberry_dacplus_startup(struct snd_pcm_substream *substream) {
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_codec *codec = rtd->codec;
+	snd_soc_update_bits(codec, PCM512x_GPIO_CONTROL_1, 0x08,0x08);
+	return 0;
+}
+
+static void snd_rpi_hifiberry_dacplus_shutdown(struct snd_pcm_substream *substream) {
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_codec *codec = rtd->codec;
+	snd_soc_update_bits(codec, PCM512x_GPIO_CONTROL_1, 0x08,0x00);
+}
+
+/* machine stream operations */
+static struct snd_soc_ops snd_rpi_hifiberry_dacplus_ops = {
+	.hw_params = snd_rpi_hifiberry_dacplus_hw_params,
+	.startup = snd_rpi_hifiberry_dacplus_startup,
+	.shutdown = snd_rpi_hifiberry_dacplus_shutdown,
+};
+
+static struct snd_soc_dai_link snd_rpi_hifiberry_dacplus_dai[] = {
+{
+	.name		= "HiFiBerry DAC+",
+	.stream_name	= "HiFiBerry DAC+ HiFi",
+	.cpu_dai_name	= "bcm2708-i2s.0",
+	.codec_dai_name	= "pcm512x-hifi",
+	.platform_name	= "bcm2708-i2s.0",
+	.codec_name	= "pcm512x.1-004d",
+	.dai_fmt	= SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+				SND_SOC_DAIFMT_CBS_CFS,
+	.ops		= &snd_rpi_hifiberry_dacplus_ops,
+	.init		= snd_rpi_hifiberry_dacplus_init,
+},
+};
+
+/* audio machine driver */
+static struct snd_soc_card snd_rpi_hifiberry_dacplus = {
+	.name         = "snd_rpi_hifiberry_dacplus",
+	.dai_link     = snd_rpi_hifiberry_dacplus_dai,
+	.num_links    = ARRAY_SIZE(snd_rpi_hifiberry_dacplus_dai),
+};
+
+static int snd_rpi_hifiberry_dacplus_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+
+	snd_rpi_hifiberry_dacplus.dev = &pdev->dev;
+
+	if (pdev->dev.of_node) {
+	    struct device_node *i2s_node;
+	    struct snd_soc_dai_link *dai = &snd_rpi_hifiberry_dacplus_dai[0];
+	    i2s_node = of_parse_phandle(pdev->dev.of_node,
+					"i2s-controller", 0);
+
+	    if (i2s_node) {
+		dai->cpu_dai_name = NULL;
+		dai->cpu_of_node = i2s_node;
+		dai->platform_name = NULL;
+		dai->platform_of_node = i2s_node;
+	    }
+	}
+
+	ret = snd_soc_register_card(&snd_rpi_hifiberry_dacplus);
+	if (ret)
+		dev_err(&pdev->dev,
+			"snd_soc_register_card() failed: %d\n", ret);
+
+	return ret;
+}
+
+static int snd_rpi_hifiberry_dacplus_remove(struct platform_device *pdev)
+{
+	return snd_soc_unregister_card(&snd_rpi_hifiberry_dacplus);
+}
+
+static const struct of_device_id snd_rpi_hifiberry_dacplus_of_match[] = {
+	{ .compatible = "hifiberry,hifiberry-dacplus", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, snd_rpi_hifiberry_dacplus_of_match);
+
+static struct platform_driver snd_rpi_hifiberry_dacplus_driver = {
+	.driver = {
+		.name   = "snd-rpi-hifiberry-dacplus",
+		.owner  = THIS_MODULE,
+		.of_match_table = snd_rpi_hifiberry_dacplus_of_match,
+	},
+	.probe          = snd_rpi_hifiberry_dacplus_probe,
+	.remove         = snd_rpi_hifiberry_dacplus_remove,
+};
+
+module_platform_driver(snd_rpi_hifiberry_dacplus_driver);
+
+MODULE_AUTHOR("Daniel Matuschek <daniel@hifiberry.com>");
+MODULE_DESCRIPTION("ASoC Driver for HiFiBerry DAC+");
+MODULE_LICENSE("GPL v2");
